Which are Not used as a depth cue by the visual system A. Size
B. Printing
C. Interposition
D. Distance

answer; i do believe that the correct answer is ( portal of exit in the chain of transmission); good luck

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.

answer; the national uniform billing committee(nubc);